popups

ur hijackthis logfile appears to be by and large clean.
i see that u have ewido and windows defender on ur system.update them then go in SAFE MODE and scan ur pc with both.
addly u can also use one of these : adaware, spysweeper, spywaredoctor,
update them, and run their scan with ur pc IN SAFE MODE.
also download and clear ur pc junk with this xclnt freeware 'ccleaner' www.ccleaner.com
use a good pop-up blocker too. google toolbar is considered as having one of the finest popup blockers !